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Study of Frequency Stabilization of the556-nm Laser for the Second-stage Cooling of Ytterbium Atoms

Author: HuangLiangYu
Tutor: XuXinYe
School: East China Normal University
Course: Optics
Keywords: Cold Ytterbium Atomic Clocks Pound-Drever-Hall Technique OpticalResonant Cavity Mode Matching Finite Element Analysis Method
CLC: TB939
Type: Master's thesis
Year: 2013
Downloads: 7
Quote: 0
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Abstract


The optical clocks will replace fountain atomic clock (microwave frequency standard) to be the next generation frequency standard. Because of the ultra-narrow linewidth (mHz) clock transition spectral, the cold ytterbium atomic has become the candidate of the optical atomic clock. To achieve the cold ytterbium atomic clock, first of all, we use399-nm laser for the first stage cooling and556-nm laser for the second stage cooling, and then loading the cold ytterbium atoms into the optical lattice for the clock transition probe.556-nm laser cooling plays a crucial role in ytterbium atomic clock, so high performance of556-nm laser frequency stabilization system is essential.Pound-Drever-Hall (PDH) technique became a better choice for the556-nm laser frequency stabilization project, for it utilizes the narrowband resonance line frequency stabilization of the optical resonator. In this paper, we use PDH frequency stabilization technology to build a556-nm laser frequency stabilization system, qualitative analysis the possible reasons that caused of the F-P cavity resonance spectral drift and propose solutions. Finally, we successfully applied the556-nm frequency stabilization laser to the cold ytterbium atomic clock, further optimize the performance of the556-nm magneto-optical trap and optical lattice to create conditions for the development of high-performance cold ytterbium atom optical clock.This paper mainly includes the following aspects:1. Starting from the basic principle, introduce the basic theory of PDH frequency stabilization technic, the difference between the reference cavities, and the relevant performance indicators and parameters of F-P cavity.2. Presentation the PDH stabilized system found processes and experimental results in detail. Including the laser control system, the F-P cavity vacuum system, the F-P cavity temperature control system, pattern matching, PDH experiment device and experimental results.3. Analyses the elements lead to the resonance frequency drift of F-P cavity, then qualitative analysis them. Using thermal radiation theory qualitative analysis the F-P cavity resonance frequency due to temperature fluctuations, finite element method to simulate the impact of vibration on the F-P cavity resonance frequency.

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CLC: > Industrial Technology > General industrial technology > Metrology > Mechanical measurement > Time and frequency measurement
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